Terminal for bushing insulators



May 22, 1928.

A. O. AUSTIN TERMINAL FOR BUSHING INSULATORS Filed July 29, 1922 JIVVENTOR M x W -,k

ATTORNEY Patented May 22, 1928.

UNITED STATES 1,670,334 PATENT oFFIcE.

ARTHUR O. AUSTIN, OI BARBERTON, OHIO, ASSIGNOR, BY/IVIESNE ASSIGNMENTS, TO

THE OHIO BRASS COMPANY, OF MANSFIELD, OHIO, A CORPORATION OF NEW JERSEY.

TERMINAL FOR BUSHING INSULATORS.

Application filed July 29,

This invention relates to conductor ter rent transmission, which will permit installation and removal of the bushing without disturbing connections within the trans-' former casing, and in which the parts are locked in connection with one another when.

installed and which shall be otherwise of improved construction and operation. The invention is exemplified in the combination and arrangement of parts shown in l the accompanying drawing and described in the following specification, and it is more particularly pointed out in the appended claims.

In the drawing Fig. 1 is a part elevation and part section showing a bushing and terminal embodying one form of the invention.

Fig. 2 is a section on line 22 of Fig. 1. A dielectric bushing 1 such as used for transformer. casings and other installations is provided with a cap 2 secured to the upper end of the bushing in the usual manner as by cement 3. A conductor extends thru an opening 5 in the bushing and comprising a rod 4 provided at its upper end with an angular member 6 to which the rod may be soldered, brazed or secured in avy suitable manner so as to form a continuation of the rod 4. The upper end 7 of the member 6 is reduced and threaded providing a shoulder 8, against which a nut- 9 may be secured upon the threaded end 7. The nut 9 is'large enough to prevent the conductor from falling downwardly thru the opening 10in the upper end of the cap 2. This opening is shaped to conform to the member 6 by fitting it rather loosely to permit a limited angular movement of the member 6' in the opening. A weather cap 11 is threaded on down tight to bring the surface 12 at the end of the member 7 into contact with the inner face of the upper end of the cap. The member 7 is held against rotation during the tightening of the cap ll-by the angular portion 6 in the opening 10. The lower end of the weather cap-11 is provided with a flange 13 having elongated slots 14 thru which cap screws 15 extend the end 7 of the member .6 and is screwed 1922. Serial No. 578,465.

into the cap 2 to hold the weather cap 11 in plate. A gasket 16 may be interposed between the caps 2 and 11 to provide a tight joint. V'Vhen the cap 11 has been tightened to bring the surface 12 against the upper end of the cap, the cap screws 15 are tightened to hold the weather cap locked in its position so that the contact between the upper end of the threaded member 7 and the end of the cap will be held tight. his

3 v Wlll also retain the pressure on the surfaces 17 of the threads on the member 7. A lead conductor 18 is connected with the outer face of the cap 11 by a threaded clamping member 19. A terminal lug 20 is secured to the conductor 18 by soldering, brazing or any usual manner, and is provided with a'coni cal surface 21 which engages a correspondingly shaped surface on the clamp 19. These surfaces produce good electrical connection between the cap 11 and the lead 18.

This .terminal construction has the advantage, in that, either a flexible conductor or a rigid conductor may be used running thru the bushing. Furthermore, the terminal may be a plied to any bushing to which a cap may e cemented.

This terminal has the advantage that while it may permit removal of the bushing by making all connections at the top, good electrical contact is insured by simply tightening the weather cap 11 down on the upper end 12 of the conductor 7. In this type of bushing, an air or oil tight joint is made pos' sible by tightening down on the gasket 16 by means of the bolts 15. In this form of terminal, it is not necessary to slide the cap on the gasket in tightening down. This makes the terminal particularly adaptable for heavy leads. A very eflicient electrical contactis provided by the large surface 17 and the hearing at the upper end 12. In installing the bushing, the conductor is drawn up thru the bushing by a wire or other means attached to a small eye and screwed into the hole 22 in the top of the terminal. The nut 9 is then screwed down to the shoulder on the hexagonal shank 6.

The nut prevents the conductor from dropping back. The weather cap 11 is then tightened down in place until there is a contact at the surface 12 and along the sides p hard bearing on the surface 12 this insures- 'said bushing.

tion 7 is prevented from rotation by the hexagonal section 6 which engages the projecting lip 23 on the main cap 2. The section 6 and the corresponding opening 10 in the lip 23 are preferably loose, so that they will permit of rotation thru an angle of several degrees. This rotation permits the boltsl5 to be properly installed without looseningthe joint between the upper end of the conductor and the cap 11; By providing slotte'd'holes 1-1 in the weather cap 11 the bolts 15 may be used to keep the conductor and the terminal cap tight.

This form of terminal has the advantage, in that, it may be applied to practically any type of bushing to which a cap may be ccmented. Means are also provided for keeping the cap member 11 locked to the conductor 7 at all times. Also, a very good degree of electrical contact may be provided as the forces in screwing down the cap are between the cap 11 and the conductor 7 without any intervening member. I

This type of terminal also has the decided advantage, in that, the expansion of ,the inner member will increase the contact pressure and lower the resistanc e. This is particularly true where the threaded contact is long and the inner member is made of material having a higher linear co-eflicient of expansion. 1

The terminal is easy to install, as the electrical contact and the seal are made independently. \Vhere large terminals carrying heavy currehts are used, this may be of particular advantage for the yielding or shrinking of the gasket 16 will not affect the pressure between the surfaces 17' and 12. The weather ca'p may also be tightened on the gasket 16 at any time without disturbing the other connections.

I claim:

1. A dielectric bushing having a cap rigidly fixed to the end thereof, a conductor extending through said cap and bushing, a terminal member threaded on the projecting end of said conductor, a positive stop for holding said conductor against rotation in said bushing, and means acting independently of said conductor for holding said terminal member against rotation relative to 2. A dielectric bushing having a metallic cap cemented to the end thereof, a conductor extending through said end cap and bushing and having a non-circular shoulder portion loosely fitting a correspondingly shaped portion in said-end cap to limit rotation of said conductor in said bushing, an

lmperforate weather cap threaded on the projecting end of said conductor and having an abutment portion arranged to engage the end of said conductor and be drawn tightly thereagainst by the' threaded engagement between said weather cap and con other.

3. A bushing member, a conductor proectmg therefrom, a-terminal cap threaded onto said conductor and having a bearlng surface arranged to be forced against said conductor by the threaded connection with said conductor, and means for holding said cap and conductor against relative rotation when locked thereto'by said bearing surface and threaded connection.

4. A bushing having a conductor extending loosely therethru and partially rotatable therein, means for limiting rotation of said conductor in said bushing, a terminal cap threaded on the projectingend of said conductor, means for limiting the movement of said conductor into said cap to place stress on the threaded connection there between, and means for preventing relative rotation of said conductor and cap.

5. A dielectric bushing having a cap secured to the end thereof, a conductor extending thru said cap and bushing, a terminal member threaded on the projecting end of said conductor, means for holding said conductor against rotation in said bushing, and means for holding said terminal member against rotation relative tosaid bushing.

thereon, a conductor extending thru said bushing, a terminal cap for closing the end of said bushing and having a threaded seat for receiving the end of said conductor, means for limiting rotation of said conductor in said end cap to permit said conductor to be tightly threaded into said seat and means for locking said terminal cap to said end cap to prevent relative rotation thereof and to form a tight joint between said caps.

7. A dielectric bushing having an end cap secured-thereto, a conductor extending thru said bushing and end cap, and having an angular portion positioned in a correspondingly shaped opening in said end cap, the projecting end of said conductor being threaded, a nut threaded onto said projecting end, a shoulder on said conductor for limiting the movement of said nut relative to said conductor and a terminal cap having a threaded seat therein for receiving the threaded end of said conductor, said terminal cap having clearance for said nut 'ectin end of said conductor and means for 6. A dielectric bushing having an end cap facilitate tightening duetor with its seat.

and fitting loosely locking said terminal member at difierent angular positions on said bushing.

9. A dielectric bushing having an end cap thereon, a conductor extending thru said bushing and projecting from said cap and having a limited movement of rotation relative to said cap, a terminal member for said conductor, means for securing said terminal member to said conductor and means for fas tening said terminal member to said end cap While said terminal member and conductor are secured to one another;

10. A bushing having an end cap secured thereto, a conductor extending thru said ,bushing and projecting from said end cap,

said conductor having limited movement of rotation relativeto said end cap, a terminal cap for said conductor, means for securing said conductor and terminal cap to one another and means for securing said terminal cap to said end cap while said terminal and end caps remain in a given angular position relative to one another.

11. A bushing having an end cap secured thereto, a conductor extending thru said bushing and projecting from said end cap, a terminal cap having a threaded seat there in for receiving the projecting end of said conductor, means for limiting rotation of said conductor relative to said end cap to said terminal cap on said conductor and means for securing said terminal cap to said end cap without disturbing the threaded connection of said con 12. An insulator bushing having a conduetor extending therethru, an end cap for said bushing, said conductor having an angular portion thereon arranged in a correspondingly shaped opening in said end cap in said opening, a terminal cap having a threaded seat therein for receiving the end of said conductor, said terminal cap having a flange provided with openings therethru and screws extending thru said openings and threaded into said end cap.

13. A dielectric bushing having an end cap secured thereto, a conductor arranged in said bushing and projecting from said end cap, means for limiting rotation ofsaid conductor in said end cap, a terminal weather cap having a threaded seat therein for receiving the end of said conductor, said weather cap having a peripheral flange thereon provided with elongated openings and screws extending thru said openings and threaded into said end cap for locking said terminal weather cap.

14;. A bushing having a removable conductor, a holding cap attached to said bushing, means for engaging saidconductor to prevent rotation, means for holding said conductor from dropping through said holding cap, a conducting terminal cap threaded on said conductor andtorming a conducting joint therewith, means for jamming said conducting joint between terminal cap and said conductor, means for tightening said conducting weather cap to said holding cap, means for securing a detachable lead to said conduct-ing cap and overlapping weather sections between said weather and holding caps.

15. A dielectric bushing having a conductor projecting therefrom, a main cap for said bushing, a closed conducting Weather cap threaded on the projecting end of said conductor, means for preventing rotation of said conductor while tightening said closed conducting Weather cap to make electrical contact between said conductor and the closed end of said weather cap, and independent means ior tightening the joint between said conducting Weather cap and the main *ap.

In testimony whereof I ,have signed my name to this specification on this 25th day of July, A. D. 1922.

ARTHUR O. AUSTIN. 

